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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e823af59b7868da8965e8bb5d8263fc58e2ec95f43d7a13d4f9417e371f6d3' 
  AND token = '9KlED8QLLBurfSPLzOrgiJ5WoR8OsYl8Rf1HoEzAXR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}